Baery State-of-Health Estimation for Mobile Devices

Insucient support of electric current sensing on commodity mobile devices leads to inaccurate estimation of their baŠery’s stateof-health (SoH), which, in turn, shuts them o‚ unexpectedly and accelerates their baŠery fading. In this paper, we design V-BASH, a new baŠery SoH estimation method based only on their voltages and is compatible to commodity mobile devices. V-BASH is inspired by the physical phenomenon that the relaxing baŠery voltages correlate to baŠery SoH. Moreover, it is enabled on mobile devices with a common usage paŠern of most users frequently taking a long time to charge their devices. Œe design of V-BASH is guided by 2, 781 empirically collected relaxing voltage traces with 19 mobile device baŠeries. We evaluate V-BASH using both laboratory experiments and €eld tests on mobile devices, showing a <6% error in SoH estimation. CCS CONCEPTS •Computer systems organization →Embedded so…ware;